Blindstitch sewing-machine.



lATENTBD AUG. 23, 1904. 0. E. HADLEY. BLIND STITCH SEWING MACHINE.

LED JUNE 16} 1902.

4 sums-sum 1.

APPLICATION II No. 768,327. PATENTED AUG. 28, 1904. U E HADLEY BLIND STITCH SEWING MACHINE.

APPLICATION FILED JUNE 16, 1902.

4 SHEETS-SHEET 2.

N0 MODEL.

W V 93 M (lbtoom 'No. 768,327. I PATENTED AUG. 23, 1904.

v G. E. HADLEY.

BLIND STITCH SEWING MACHINE. I APYLIOATION Hum Jun: 16,1902. v no 'uonnn. 4 sums-sum s.

. 'PATBNTED AUG. 23, 1904. 0. E. HADLEY. BLIND STITCH SEWING MACHINE.

APPLIGATION ,FILED JUNE 16. 1902. I

4 SHBETSSHEET 4 N0 MODEL.

' UNITED STATES Patented August 23, 1904.

PATENT OFFICE.

.BLINDSTITCH SEWING-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 768,327, dated August 23, 1904.

Application filed June 16, 1902. Serial No. 111,872. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES E. HADLEY, a

citizen of the United States of America, and a relatively to but independent of each other .to

produce the best results.

' More specifically my invention comprises a novel method of operating the needle-bar, which in the present instance is mounted for oscillation and carriesa needle curved substantially concentrically from the axis of said needle-bar.

My invention furthermore comprises a looper cooperative with the needle and forming a chain-stitch, this looper being mounted for reciprocation and oscillation, both of said movements being performed by separate and independent devices, each of which may be regulated or adjusted independently of the other.

The bed is in the present instance of avertically-oscillatory type and is movable around a fixed axis, resilient means being preferably employed to force the table upward against the presser-foot.

In the accompanying drawings, in which similar characters denote similar parts, Figure 1 is a side view of a sewing-machine constructed in accordance with my invention, the

side plate or cover being removed to disclose the interior of the frame. Fig. 2 is anend view of the machine. Fig. 3 is a section on line 3 3 of Fig. 1. Fig. 4: represents a central horizontal section of the machine; and

Figs. 5 to 10, inclusive, are details of some parts of the mechanism, as will be hereinafter fully described. Fig. 11 is a longitudinal vertical sectional view of the link which connects the feed-dog and its operating-lever, taken on the line 00 00 of Fig. 1.

In the drawings, 20 denotes a suitable frame having a bearing 21, in which the primary driving member 22 is journaled. This primary driving member or shaft carries a bandwheel 23, which may form part of a fly-wheel 24:, as is usual in sewing-machines. At its other end said shaft 22 is journaled in a bearing 25, forming a part of the cover 26, which may be attached to the frame 20 in any suitable manner and which covers an opening to which access may be had to the interior of the frame.

Mounted on the shaft 22 is a bevel-gear 27 meshing into a similar bevel-gear 28, which is journaled on a spindle 29- and has in its preferred form a sleeve 30, constituting an eccentricdriving member disposed at an angle to the primary driving member and rotatable at the same speed as that of the latter.

All the various mechanisms are operated from the driving members, and in order to obtain a clear understanding of the several operations I will describe the several parts consecutively and in detail.

The needle 31 is carried in an arm 32, adjustably secured to a needle-bar 33, made in the form of a shaft and journaled in the frame20. This shaft has an oscillatory movement controlled by a rotatable member on the secondary driving member 29 above mentioned. Near the rear end this'oscillatory needle-shaft 33 has mounted thereon a crank-arm 34, connected with a rotatable member or eccentric 35, adjustably secured upon the sleeve 30- as, for instance, by a set-screw 36. (See Fig. 3.)

The looper is indicated by the numeral 40, and its formation and function are substantially similar to that shown in the patent of O. A. Dearborn,'No. 639,669, granted December 19, 1899, and to which reference may be had. The looper has a reciprocatory movement imparted thereto-as, for instance, by aneccentric 41, mounted upon the primary driving member 22, the strap 42 of which may be connected to an arm 43, forming a part of a slide A l, which is held in ways 45-, secured to the frame of the machine.

Passing through the arm 43 and rotatably mounted therein is a looper-bar 46, shouldered at 47 and having a collar 48 at opposite sides of the arm 43, respectively, so that as the arm 43 is reciprocated by the eccentric 41 said looper-bar 46 will give proper longitudinal movement to the looper 40, as will be readily understood. The looper has also an oscillatory movement, and hence 1 preferably form the looper-bar 46 polygonal in cross-section and mount the same for reciprocation in a sleeve 49, journaled in a bearing 50 and a hanger 51, both forming a part of the frame 20. Oscillatory movement may be imparted to the sleeve 49as, for instance, by an eccentric 52, mounted on the secondary driving member 30 and adjusted thereon similarly to the eccentric 35, but independently therefrom, the strap 53 being connected with an arm 54, mounted and secured upon the sleeve49 above mentioned.

From the foregoing it will be seen that the looper-bar has two distinct movementsviz., a reciprocatory movement longitudinally of the machine and an oscillatory movement around the axis of the looper-bar 46, both of these movements being entirely distinct and independent of each other, and consequently variable as to their timing.

"he work-table is in the present instance also movable vertically and is so organized that its movement may be adjusted for any thickness of material to be operated upon.

Referring first to the presser-foot 60, (see Fig. 2,) it has been stated that this presserfoot is normally stationary during the operation of stitching. On the other hand, means are provided for varying the position of said presser-foot relatively to the needle, these means consisting substantially of an adjustable screw 61, rotatably held in a block or bracket 62, which may be secured to the head or frame of the machine in any convenient manner. The screw 61 is in engagement with a correspondinglytl1readed aperture 63 in the upper portion of the presser-foot 60, so that the actual working surface 64 of said foot may be closely regulated relatively to the needle 31, and consequently a blindstitch or an overseam may be performed on the machine, as required.

Organized for cooperation with the presserfoot is a working table, (denoted herein by 70,) and preferably angular in cross-section, so as to form a bend in the material to be operated upon and to afford to the needle an opportunity of performing its Work properly. The tablehas, as above stated, a vertical movement, the upward movement (toward the presser-foot) being caused, preferably, by resilient means (shown herein as a spring 71) interposed between the base of the frame and the plate 72, secured to the under side of the bed or bar 73. This bar is shown as having an oscillatory movement arounda fixed axis 74 in the frame, and the upward movement thereof may be limited-as, for instance, by a nut 75 in screw-threzuled engagement with a stud 76, pivoted at 77 to the bar 73 and passing through an car 78, forming a part of the frame whilc a stop-nut 79 may be employed above the car 78 to limit the downward movement of the bed or table 73 as the latter is depressed by any convenient means to receive the work to be operated upon.

The feed-dog 80 is preferably pivoted intermediate its ends, as at 81, so as to have a vertically-oscillatory movement of predeter mined amount, while at the same time a longitudinal movement may be imparted to said feed-dog at the proper time. To this end the feed-dog 80 is pivotally supported in a slide 82, supported in the table 71), to which a longitudinal movement may be in'iparted by an actuating-lever 83, pivotally supported on said slide, as at 84.

The upper end of the actuating-lever 83 may be provided with a pair of verticallydisposed ribs 85, adapted to receive between them a block 86, which may serve as a w airing member for an eccentric 87, mounted upon the primary driving member 22 and preferably forming a part of the bevel-gear 27, above referred to.

From this organization, as thus far described, it will be seen that while the vertical movement of the rear end of the lever 83 is not confined the longitudinal movement of the lever, and consequently that of the slide 82, is controlled by the movement of the eccentric 87.

Means are provided for imparting a vertical movement to the feed-dog 81), this movement being also accomplished by the lever 83, having an extension 88 connected with the feed-dog 80, preferably in a manner indi aited in Figs. 1 and 11, and comprising a link l), formed in two parts 89 and 90, respectively, the former of which telescopes into the latter and carries a collar 91, secured thereto by screw 92 passing through a slot 93 in the member 90. The member of the link l; is provided with a collar 94, and a spring, such as 95, may be interposed between the collars 91 and 94, thus forming a yielding connection between the lever 83 and the dog so.

Means are provided whereby the Zone of vertical movement of the feed-dog 80 may be varied without in any way inliueneing the amount of such movement, and for this reason 1 preferably provide the link-section 89 with a slot 96 to permit adjustment of the link L relatively to the arm 88 of the lever 83, as will be readily understood. The vertical movement of the dog 80 is in this case effected by the movement of the arm 88 around the pin 84 as a fulcrum, the lever 83 being provided at its rear end with a pair of projecting faces 97, adapted to receive between them a block 98, to which a reciproeatory movement in said ways may be imparted by an eccentric 99, operatively connected with the primary driving member 22, but being organized to vary the throw thereof substantially in the manner as shown in Figs. 7 to 9, inclusive. Here the eccentric 99 is shown as having a rearward projection 100, fitting into a correspondingly-formed groove 101 in the eccentric 87 ,'so that the eccentric 99 may have a sliding movement relatively to the latter, such movement being regulated bya screw 102 in screw-threaded engagement with the eccentric 99, but being rotatable without any movement inthe eccentric 87 It is of course evident that the particular construction of effecting this adjustment may be varied as desired, the screw 102 being in the present instance provided with an annular groove 103, the walls of which engage a pin 104:, firmly held in the eccentric 87.

' From this description it .will be seen that while the timing of the respective operations will not be affected in any way the eccentricity of the eccentric 99 relatively to the primary driving member 22 may be increased or decreased, thus varying the longitudinal travel of the feed-dog without affecting the rise or fallthereof. i

Many changes may be made in the particular methods of effecting the various adjustments without departing from the spirit of my invention, and for this reason I wish .it

. distinctly understood that I do not confine myself to the use-of the specific construction of the several elements as hereinbefore described. v

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is I 1. The combination with a frame and a table pivoted thereto, of a primary drive member,

bar working through the sleeve and rotatable therewith, an eccentric upon the primary drive member, a strap upon said eccentric, a connection between the strap and the looperbar, an oscillatory needle-shaft mounted in the frame, a second eccentric' adjustably mounted upon the secondarydrive member,

a strap upon the eccentric and a connection between the strap and the needle-shaft.

2. The combination with a frame and a table pivoted thereto, of a main drive-shaft, a secondary drive-shaft driven from and disposed at substantially right angles thereto, an axially-oscillatory sleeve disposed substantially.

parallel with secondary shaft, an eccentric upon the secondary shaft, a crank-arm upon the sleeve, a strap connection between the eccentric and the crank-arm to oscillate the sleeve, an endwise-reciprocatory looper-bar working through the sleeve and rotatable therewith, an eccentric upon the main driveshaft, a strap upon the eccentric, and an arm carried by and projected laterally from the looper-bar and pivotally connected to the strap.

, Signed by me at Springfield, Massachusetts, in the presence of two subscribing witnesses.

CHARLES E. HADLEY.

Witnesses: WM. S.-BnLLows, M; A; CAMPBELL. 

